Thomas hagan



itl-Mud gmt@ Amt-mu Letters Patent No. 92,721, dated July 20, 1869.

IMPROVEMENT IN LOCK-NUTS.

The Schedule referred. to in'these Letters-Patent and making part of the same.

To all whom it 'may concern Be it known that I, THOMAS HAGAN, of Rochester, iu the county of Beaver, and State of Pennsylvania, have invented a new and useful Improvement iu Lock- Nut`for Bolts; and I dolherebyl declare that the following is a full, clear, and exact description thereof', reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in providing the screw-nut of a bolt with a recess or recesses for a key or keys,rso arranged that a portion of the key or keys will extend over the opening ofthe screw-nut, so that by cutting away a poition of the thread of the bolt, the nut may be permanently secured on the bolt.

To enable others skilled in the art to make and use my invention, I'will proceed to describe its construction and operation.

In the accompanying drawings, which form part of my speeication- Figure 1 is a side elevation of my improvement.

Figure 2 is an end view or plan of the same.

A represents. the lock-nut, which is provided with recesses for the keys e, as shown in fig. 1.

B represents the bolt, with a portion of the screwv By thus keying the nut on the bolt, it Wil1beim-- possible for the nut to turn until the keys are removed.

I wish it clearly understood that I do not claim broadly the use of Aa key or keys, when usedin com-r bination with avscrew-nut and bolt.

Having thus described the nature, construction, and operation of my improvement, f

What I claim a's -of my invention,`is- A screw-nut, provided with recesses or chambers for keys, said recesses or chambers and ykeys being so arranged, with relation to the openings of the nut, as

to secure it on the bolt through the medium of keys, as herein described.

THOMAS HAGAN.

Witnesses: l DAVID STEWART, J AMES J. J o HNs'roN. 

